Pat Camden, spokesman of the Fraternal Order of police, said officers assigned to a gang crimes unit heard gunfire and pursued three people running away. A statement from the Chicago Police Department's Office of News Affairs said one of the runners stopped to point a weapon at police, drawing fire from an officer.

Kevin Rivera, 16, was killed late Saturday when a gunman on a bicycle shot him as he walked in an alley near his home, the Chicago Sun-Times reported.

"I had a family from my parish tell me recently that their 10-year-old son didn't want to come back to Chicago from vacation because of the violence," the Rev. Michael Pfleger of St. Sabina Catholic Church said.

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